Lock protection



Aug. 2, 1932. G, Bols'soNNAum LOCK PROTECTION 2 SheetsTSheet l Filed Nov. 17, 1925 ,QN Q M .21m i ww QN QN NNW NN @mx mm. i mm MN Nm. 1 .H \N NY .w E. w, WN MH. .1 1|. wwwa? NN mm Aug. 2, 1932. G. Bo|ssoNNAULT 1,869,404

LOCK PROTECTION Filed Nov. 17, 1925 2 Sheets-Sheet 2 Patented Aug. 2, 1932 UNITED STATES PATENT oFFlcs x GASTON BOISSONNAULT, OF VALLEY STREAM, NEW YORK, ASSIGNOR TO CHARLES P.

KIMMEY, TRUSTEE, OF NEVI YORK, N. Y.

LOCKY PROTECTION Application led November 17, 1925. Serial No. 69,573.

The obj ects of this invention are. to provide simple and effective means for protecting door locks andthe like which will be readily attachable to existing door locks and which will be fully effective to give notice of' any tampering with or injury to the lock.

A further special Objectis to provide an effective alarm which can be rendered inoperative so that an alarm will not be given unnecessarily when the lock is operated by one having a rightto do so.

Another object of the invention is to pro-y vide the alarm in the form of an attachment applicable as a single unit over standard locks now in service.

Other'objects and the various novel features of the invention by which such objects are attained will all appear in the course of the following specification.

The drawings accompanying and forming part of this specification illustrate the invention embodied in a number of different practical forms, but it is to be understood that the structure may be further varied without 2,5 departure from the spirit and scope of the invention as hereinafter defined and broadly claimed. Y

Figure 1 is a front view of the combined protector and alarm as applied to a standard Yale lock.

Figure2 is a vertical sectional view of the same showing the cover ofthe device unlocked to gain access to the keyway of the protected lock.

' Figure 3 is a rear view of the device.

Figures 11 and 5 are diagrammatic vviews of a closed circuit and open circuit system respectively which may be used with the device.

The protector which isapplied to the front ofthe doorlO comprises in thepresent disclosure, a small casing 11 having a chamber `12 in its upper portion containing the electrical mechanism and a lower chamber 13 enclosing the face 14 of the lock 14a. he lock enclosing chamber is` closed Vby a cover 15 hinged at its lower end at16 so that it will automatically drop down when released and 50 this cover carries at its upper end, acupped projection 17 to engage over and make con# tact with an insulated circuit terminal 18.

The upper chamber 12 of the protector casing is closed by a door 19 hinged at the side at 20 and secured by a lock 21. This 55 door engages over the contact making projection 17 of the lower cover 15, as shown in Figure 1 so as to secure the lock cover 15 in its locked protective position. f

'The upper portion of the casing is sepa 50 rated by the intermediate partition 22 into the forward compartment 12 and a back compartment 23, the latter housing the wiring connections.

On the back of the partition 22, a base 24 o5 of wood or 'other suitable insulating material is secured, carrying a series of switch points 25 with whichthe lever 26 cooperates, the spindle 27 of said lever projecting through to the front chamber and there provided with a dial or other suitable indicator 28. j

This dial has a iinger-hold 29 by which it can be turned and is show as detachably held on a squared or angular portion 8O of the spindle by the screw 31. Access is had to this screw after removal of a detachable 'cover plug 32, such construction permitting the po'` sition of the dial with respect to the switch arm being readily changed.v

The protector isshown secured to the front of the door byscrews 33 housed within the casing and which can be reached only when the casing is open.

rIhe removal ofthe protector casing is made an element of the lock protection by providing in the present disclosure, a spring contact 84 which by engagement with the face of the door is forced into contact with a spring 35 and another door engaging con tact 36 .cooperating with a contact spring 37. 9@

These two pairs of contacts are mounted on the back of the insulating base, the iirstpair at the top andthe second pair at the lower portion of the casing so as to give an alarm if an attempt is made to pry oii'l the protector 95 at the top or at the bottom. The pin contact 18 is shownv as of the yielding spring pressed type mounted in an insulating holder 38.

The protector may operate on either the normally closed or the normally ope-n" circuit 10o principle. Examples of such circuits will be described before considering the lock guarding mechanism which is applied over the lock on the back of the door.

In the closed circuit arrangement shown in Figure 4, the closing of the door, by means of a plate 89 completes a circuit between contacts 40, 41. The first of these contacts is connected by conductor 42 with Contact spring and from the outer door engaging contact 34, the conductor 43 is shown extending to the inner contact spring 87. 1`he companion or lower door engaging spring 36 is connected by conductor 44with the pin contact 18. The lock coverl is in metallic connection with the casing, which latter may be considered as a common ground, being made a part of the circuit by means of a'terminal 45 in electrical connection with the casing. Aconductor 46 is led from this terminal to one side of a closed circuit relay 47, the opposite side of which is connected by conductor 48 with a battery or other source of current 49. From the other side of this battery, a conductor 50 leads to the other door terminal 41.

Upon interruption of the circuit described, either by forcing the door, where the circuit would be broken at the points 40, 41, or by forcing the protector casing away V`from the door, where the circuit would be broken at contact springs 34-35 or 86-87, or by breaking open the casing, whereupon thelock cover 15 would drop down and break circuit with pin contact 18, the circuit through the relay will be interru ted and the relay would then act in the well rnown manner to close the circuit through the bell or alarm 51 by means of an independent ringingcircuit 52. Hence any tampering with Vthe door or with the pro` tector will set od the relay to produce a con` stant ringing of the alarm. The effect will be the same'if the wiring leading to the relay is broken at anypoint.

Authorized opening of the lock is permitted without setting oil" the alarm byone having a key to the protector and knowing the necessary combination. Such a party may open the door to the protector by mea-ns of a key fitting the protector lock 21, Figure 1holding the lock cover 15 closed while opening the protector door and then turning the dial to carry the switch arm 26 into engagement with the single live Contact 25a which is connected by wiring 58 with the battery line 50. The turning of the dial switch to this point, as will be clear from Figurer 4, closes a circuit through the relay entirely independently of the protective circuit, holding the alarm inactive while such person is inserting the key in the door lock and opening the door. Hence the proprietor of a store to which the system is applied, knowing the necessary combination and being Jfamiliar With the action oi the protector, may open his store without unnecessarily setting off the alarm. A. secretly placed switch may then be operated to render the system inoperative while the door remains open.

In an open circuit system such as indicated in Figure 5, all the switch points are energized with the exception of one, denoted 256, so that to open the circuit and render the system inoperative, a. person must know the ligure to whichthe dial must be turned to prevent the giving of an alarm when an authorized entry is made, using the key to the door. The cooperating contacts in this case operate revers-ely of the above described, that is, when the door is forced, the contact 39 closes a circuit with contacts 40, 41'; or when the protector casing is forced, contact springs 34, 35 or 36, 37 close a circuit, or when the lock cover 15 is forced, the pin contact 18 closes the circuitenergizing the relay 47', causing that to set into constant operation, the alarm 51.

lhat is claimed is:

1. ln lock protection, the combination with a key actuated lock, of a movable cover over said lock and which can be opened to eX- pose the lock for insertion of the lock actuating key, signal means operable by such opening of the lock cover, control mechanism for rendering said signal means inoperative and a movable cover over said control mechanism for holding the lock cover closed over the lock Yand whereby upon release oi said second cover the control mechanism will be exposed to enable one familiar with the same to render the signal means inoperative when the lock cover is thus released by said second cover.

2. ln lock protection, the combination with a key actuated lock, of a movable cover over said lock and which can be opened to eX- pose theV lock ifo-r insertion of the lock actuating key, signal means operable by such opening of the lock cover, control mechanism for rendering said signal means inoperative and a movable cover over said control mechanism for holding the lock cover closed over the lock and whereby upon release of said second cover the control mechanism will be exposed to enable one `familiar with the same to render the signal means inoperative when the lock cover is thus released by said second cover, said control mechanism including a combination dial concealed by the second door when closed and exposed upon the A opening of said secondL door.

3. In lock protection, a casing for housing the key-way of a lock, said casing including a lhinged cover shiftable to conceal or to expose the key-way and a door overlying said cover, signal means operable by the opening of said cover and control mechanism VJfor rendering said signal means inoperative independently of the action of said cover, said control mechanism being housed within the j casing behind said door.

4. In lock protection, a casing for covering a lock, said casing having a key controlled door and a lock protecting vcover positioned to beheld by the door in its'lock protecting, position, a dial in the casing exposed by the opening of said key controlled door, an alarm operable by the opening of the cover and means operable byV said dial for preventing operation of the alarm by the cover when the dial is placed in a predetermined position.

5. In combination with a key actuated door lock, a movable cover for said door lock and ymeans for mounting the same in position to expose or to preventl access toy the key-way of the lock, alarm mechanism retained inoperative by said cover when the cover is closed and operable on the opening of the cover, selective switch mechanism for rendering the alarm mechanism inoperative when the cover is open, a door providing access to said switch mechanism and overlying the cover in its Closed relation, a lock for said door and means for holding the cover closed when the door isV first opened to give access to the switch mechanism.

In witness whereof, I have hereunto set my hand this 1st day of October, 1925.

GASTON BOISSON NAULT. 

